I know this world well. The above notes on all back injuries being different, individuals responding differently to treatments, and even the idea that one treatment on it's own are pretty spot on. Here's my story...
I was an athlete through my of my 20s, competing in Brazilian jiu-jitsu, submission grappling, and teaching them alongside MMA. I was in excellent shape, and like most wrestler's you know, had excellent core and back strength. And then in 2013 I was rear-ended in a car accident that herniated a total of 7 discs (depending upon which MRIs you read... and interpretation and reading have their own problems...) ranging from my C3-4, through L5-S1. I've suffered from constant neck and back spasms, severe numbness, tingling, and radiating pain through my arms, weakness, numbness in my left leg, sleeplessness, etc. There were times when sitting for more than 30 minutes was intolerable and it felt nearly impossible to hold my head up. This isn't touching on how it changed my career, economics, other elements of my lifestyle, or the psychological mess that followed. In short, this forum's censors wouldn't allow me to properly describe how awful it has been at times. That said, this forum was also helpful for me in that it allowed me to learn and share even when I've been too banged up to get out on the water.
As for treatment, I've had nerve ablations, steroid injections, chiropractic and massage work, stretching exercises, a wide variety of PT, inversion/decompression, TENS, every painkiller and muscle relaxer imaginable (Dilaudid makes you feel completely numb to the world, and taking it really shed some light on how someone can become so easily addicted to heroin), and ultimately an L5-S1 fusion. To say the least, the accident has put me through the ringer, but I have learned some things.
Being in Philadelphia, I have incredible health care options and one of the best bar surgeons in the world performed my fusion. Generally, the surgery has a lot of risks and doesn't always fix the problems, so it was a last resort. I was not a candidate for having the disc shaved (mentioned above), and I don't know what my surgery decisions would have been without access to Dr. Vaccaro and Rothman Institute. If sciatica is your issue and you are a candidate for having the disc shaved, the recovery can be very fast and with little risk. I'd advise that route before looking into a fusion or disc replacement where possible. If surgery becomes something you're seriously considering, please PM me and I'll be glad to offer whatever advice and answer any kinds of questions I can.
My surgery was in 2015, the recovery was a very long process that took close to 2 years before I started to feel a new "normal" (saying I felt healed or 100% wouldn't be accurate). Now, I have to be mindful of certain things, make sure that I'm in the gym exercising, and not allowing myself to spend prolonged periods in any one position for any long period of time.
As for fishing, I was able to get out more in 2017 than I had in a very long time. I have a very comfortable kayak that allows me to be out for a full day if I'm smart and wading in trout streams has become possible again. Do I have rough days afterwards? Sometimes, but compared to what I was feeling daily before surgery, I'll kindly accept them. I wear a back brace probably 90% of the time I'm on the water and it does seem to help provide support.
Hopefully some of this helps. I'm still dealing with the legal mess that's still going on, and typing this out is kind of cathartic for me. Good luck, and if I can help in any way, please reach out.